Mine air stop



' Dec. 18 1923. I 1,478,303

' s. H. SNYDER MINE AIR STOP Filed April 5 1922 2 Sheets-Sheet 1 Snyder Dec. 18 1923.

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Patented Dec. 18, 1923.

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Application filed April 5,

To all whom it may concern:

Be it known that I, STEPHEN'H. SNYDER, a citizen of the United States, residing at West Pittston, in the county of Luzerne and State of Pennsylvania, have invented certain new and useful Improvements in Mine :iir Stops; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it apper-' tains to make and use the same.

The present invention relates to means for controlling the ventilation of mines and has for its object the provision of an air stop, whereby a relief for excessive pressure is afforded without entailing partial or entire destruction of the stop when blasting.

Other objects and advantages will be ap parent and suggest themselves as the nature of the invention is understood.

WVhile the drawings illustrate an embodiment of the invention it is to be understood that in adapting the same to meet different conditions and requirements, various changes in the form, proportion and minor details of construction may be resorted to without departing from the nature of the invention.

Referring to the accompanying drawings forming a part of the application,

Figure 1 is a sectional detail, showing the invention applied,

Figure 2 is an elevation of the air stop,

Eigure 3 is a. horizontal section on the line 33 of Figure 2,

Figure 4 is an enlarged vertical section on the line l- 1 of Figure 2, the open position of the relief door being indicated by dotted lines, and

Figure 5 is a detail.

Corresponding and like parts are referred to in the following description and designated in the several views of the drawings by like reference characters.

The air stop comprises a frame 1 which conforms approximately to the outline of the drift or passage in which the stop is to be located. This frame is preferably constructed of wood, the several members being secured at the angles or corners in any substantial way. A horizontal strip 2 is secured at its ends to the upright or side members of the frame 1 in any preferred way. Spaced vertical strips 3 are secured to the top member of the frame 1 and to the horizontal strip 2 and provide an opening which is normally closed by means of a door 4 which 1922. 7 Serial No. 549,947.

is mounted to swing whereby to automatically open to relieve excessive pressure and to automatically close to retain the normal pressure necessary for proper ventilation. w

A suitable textile 5, such as canvas, covers the frame 1, with the exception of the relief opening which is closed by the door 4.- Edge portions of the textile or canvas project beyond the frame 1, as indicated at 5, to insure a close jointbetween the frame 1 and the" walls of the passage in which the air stop is located so as to prevent waste of air. Blocks 7 are attached to the frame 1 and serve-to secure the frame in the located position and to brace the projecting marginal portions 5 of the textile. The textile 5 is confined between the frame 1 and the blocks 7. V7 hen the device is in position, it is stayed by means of braces 6 which are interposed between the top member of the frame 1 and the floor of the mine.

The door 1 may be of any construction and usually consists of boards held together by means of cleats 9. The door 1 is pivotally connected at its upper end to the top of the frame 1 by suitable hinges 10., A cross piece 11 limits the closing of the door and maintains the same in predetermined position. A spring 12, preferably of the helical type, normally operates to hold the door 41 closed and is interposed between a bracket 13 and the door, said bracket being attached to the strip 2.

It will be understood from the foregoing, taken in connection with the accompanying drawings, that the invention results in the provision of an air stop for mines which is light and cheap in construction and which is automatic in action to relieve excessive pressure incident to blasting and to automatically close and prevent waste of normal air pressure essential for proper ventilation. FJhen a blast is set ofi, the door 4: automatically opens against the tension of the spring 12 and when the excessive pressure due to the blast has been relieved, the

- reticulate form to constitutea frame, acovrsaid textile eoyering to the frame, said, tex; tile coveringhavin'g. a portiO-nlpnojectihg beyond the frame, said portion being dlsposed in contact with the o ter ed%esof the 1 portion cleats to insure positioning of sai by the cleats and a close joint betweenthe frame and the wall of the mine, saidfstop having an opening therethro igh, anda pres sure-operable relief door normally closing said opening.

2. A mine air stop consisting of a plura-lity of frame. members. joined together in ering for said-frame, the framebetyveen certam of said-members hav ng an open ng, a

door carried by the. frame and normally,

closing said opening, and means on the frame and coacting with 1 the door to nor mally maintain the door: closed; and, operable by the, door to permit openingzvo-f the latter. upon predetermined air pressure.

3; A mine air stop consisting of a frame comprising a plurality offrame members;

' bracket extending forw ardly from one "of the frame members, a rod. connected to the 7 door and-.- slidablethrough said bracket, and an, expans ve spr ng on sa d rod and engag- 1n g= sa d bracket at one end. and said door door. upon predetermined pressure Within the,mine. V 7 In testi ony whereof I affix my signature inpresence of two Witnesses. i

i tnese e:

A BEM MAMI FREQ. M, KAIS R.

at the-o hfili end to permit openingof the 1 "STEPHEN H. SNYDER. 

